.back-prev {
  height: 120px;
  font-size: 48px;
  font-family: NotoSansHans;
  font-weight: 400;
  color: #ffffff;
  background-color: #2e57ff;
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  line-height: 120px;
  text-align: center;
}
